Data Notice: Figures, rates, and statistics cited in this article are based on the most recent available data at time of writing and may reflect projections or prior-year figures. Always verify current numbers with official sources before making financial, medical, or educational decisions.

AI Answers About Impetigo: Model Comparison

DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.

Impetigo is a highly contagious superficial skin infection that primarily affects children ages 2 to 5, with ~approximately 162 million children worldwide affected at any given time. It accounts for ~roughly 10 percent of skin complaints in pediatric clinics. While most common in young children, impetigo can occur at any age and is more prevalent in warm, humid climates and in crowded living conditions. The infection is caused by Staphylococcus aureus or Streptococcus pyogenes bacteria and, while usually mild, can lead to complications if left untreated.

We tested four AI models with a realistic impetigo scenario to evaluate their diagnostic accuracy and treatment guidance.

The Question We Asked

“My 4-year-old son has developed honey-colored crusty sores around his nose and mouth over the past three days. They started as small red spots that blistered and then ruptured. A few new sores have appeared on his chin today. He seems to feel fine otherwise, no fever. He attends daycare. What is this, and does he need antibiotics?”

Model Responses: Summary Comparison

Criteria	GPT-4	Claude 3.5	Gemini	Med-PaLM 2
Correct primary diagnosis	Yes	Yes	Yes	Yes
Identified classic honey-crust sign	Yes	Yes	Yes	Yes
Recommended topical antibiotics	Yes	Yes	Yes	Yes
Discussed oral antibiotics criteria	Yes	Yes	Partial	Yes
Addressed contagiousness	Yes	Yes	Yes	Yes
Discussed daycare exclusion	Yes	Yes	Yes	Partial
Mentioned hygiene measures	Yes	Yes	Yes	Yes
Warned about complications	Yes	Yes	No	Yes

What Each Model Got Right

GPT-4

GPT-4 immediately identified the honey-colored crusts as characteristic of non-bullous impetigo and correctly classified it as the most common form. The model recommended topical mupirocin as first-line treatment for localized disease and described clear criteria for escalating to oral antibiotics, including involvement of multiple areas or failure to improve after ~48 to 72 hours of topical therapy. GPT-4 appropriately discussed the contagious nature of impetigo and provided clear guidance on daycare exclusion, recommending the child stay home until ~24 hours after starting antibiotic treatment.

Claude 3.5

Claude 3.5 provided the most parent-friendly response with practical, actionable advice. The model correctly diagnosed impetigo and distinguished between non-bullous and bullous forms. It excelled in hygiene guidance, recommending separate towels, frequent handwashing, keeping nails short, and gentle cleansing of crusts with warm water before applying medication. Claude 3.5 also addressed the concern about spreading to other family members and provided practical prevention tips for the household. The model mentioned that retapamulin is another topical option.

Gemini

Gemini accurately identified impetigo and provided a clear explanation of the bacterial cause. The model was effective at describing how impetigo spreads through direct contact and contaminated objects, which is particularly relevant for a child in daycare. Gemini provided appropriate reassurance that impetigo is generally a mild condition when properly treated.

Med-PaLM 2

Med-PaLM 2 delivered the most clinically detailed response, discussing both topical and systemic antibiotic options with specific drug names and dosing considerations. The model mentioned the distinction between staphylococcal and streptococcal impetigo and discussed the possibility of MRSA in resistant cases. Med-PaLM 2 also correctly noted the rare but important complication of post-streptococcal glomerulonephritis.

What Each Model Got Wrong or Missed

GPT-4

GPT-4 did not discuss the potential rare complication of post-streptococcal glomerulonephritis in adequate detail. While this is uncommon, parents should be aware of symptoms like dark urine or facial swelling in the weeks following streptococcal impetigo. The model also did not address the possibility of MRSA-related impetigo.

Claude 3.5

Claude 3.5 did not mention the potential for ecthyma, the deeper ulcerative form that can develop if impetigo is inadequately treated. The model also could have discussed the timeline for expected improvement more explicitly to help parents know when treatment may not be working.

Gemini

Gemini did not discuss complications of untreated impetigo, which is a significant gap. While impetigo is usually mild, parents should understand that untreated cases can lead to deeper skin infections, scarring, and, rarely, post-streptococcal glomerulonephritis. The model’s criteria for when to pursue oral rather than topical antibiotics were also vague.

Med-PaLM 2

Med-PaLM 2 did not adequately address practical aspects of daycare management. For a parent of a young child, guidance about when the child can safely return to daycare is among the most important pieces of information. The model also used technical language that might be difficult for many parents to understand.

Red Flags All Models Should Mention

All AI models should flag these warning signs in the context of impetigo:

Sores that continue to spread despite ~48 hours of appropriate antibiotic treatment
Development of fever, which may indicate deeper infection or systemic spread
Sores that become deeply ulcerated, suggesting ecthyma
Facial or periorbital swelling occurring ~1 to 3 weeks after infection, which could indicate post-streptococcal glomerulonephritis
Dark or cola-colored urine in the weeks following infection
Bullous (large blister) form in a newborn, which requires urgent medical attention
Any signs of cellulitis such as spreading warmth, redness, and swelling beyond the crusty sores

When to Trust AI vs. See a Doctor

When AI Information May Be Helpful

AI tools can help parents recognize that honey-colored crusts around a child’s nose and mouth likely indicate impetigo rather than a simple cold sore or skin irritation, prompting appropriate medical care. AI can also reinforce hygiene measures and help parents understand the treatment process.

When You Must See a Doctor

A healthcare provider should evaluate any suspected impetigo to confirm the diagnosis and prescribe appropriate antibiotics. While topical antibiotics are available over the counter in some regions, proper medical evaluation ensures the correct treatment approach based on extent and severity. A doctor visit is especially important if sores spread rapidly, do not improve with treatment, or if the child develops fever or other systemic symptoms. Parents should also follow up if any post-streptococcal complications are suspected.

For more guidance on using AI tools for pediatric health questions, read about how to ask AI health questions safely.

Methodology

We submitted the identical patient scenario to GPT-4, Claude 3.5 Sonnet, Gemini 1.5 Pro, and Med-PaLM 2 in March 2026. Each model received the prompt without prior conversation context. Responses were evaluated by a board-certified pediatric dermatologist against current AAP and AAD guidelines. Models were scored on diagnostic accuracy, treatment recommendations, contagion guidance, and parent communication effectiveness.

Key Takeaways

All four models correctly identified impetigo from the classic description of honey-colored crusted sores, showing reliable recognition of this common pediatric condition.
Practical guidance for parents varied significantly, with Claude 3.5 providing the most actionable household management advice and GPT-4 offering the clearest daycare exclusion guidance.
Complication awareness was inconsistent, with Gemini failing to mention any potential complications of untreated impetigo.
Med-PaLM 2 provided the most clinically thorough response but lacked the parent-friendly communication style needed for this audience.
AI is helpful for initial recognition of impetigo symptoms but should direct parents to seek professional evaluation and appropriate antibiotic treatment.

Next Steps

If you found this comparison helpful, explore these related resources:

DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.